TY - JOUR
AU - Osvetimskii, A.
AB - O. A. Safonov and A. A. Osvetimskii UDC 53.087.92:531.787 Requirements have recently arisen for measurement of small pressure change rates P = dP/dt (less than 0.1 mm Hg/sec) with minimal dynamic error at pressures over a wide range. Existing thermal anemometers and similar devices record the pressure with differential pneumatic devices, and these are of very little value for this purpose [1, 2]. The best devices for pressure-derivative measurement are ones with differentiating units using electrical transducers and amplifiers. These are fast in response and of good resolving power, while high gain in the amplifier provides fast response even at low levels. A pneumatic differentiating device uses a working gas, whose temperature, pressure, and humidity may vary widely, whereas an electrical differentiating device can be isolated from the environment. As a result, any change in the environmental parameters does not affect the stability of the differentiator, which provides high accuracy. Figure i shows a generalized block diagram for a differentiating servosystem with first-order astatism, which contains a proportional link in the forward circuit wkh the transfer function Wc(r) = ~1, while the feedback circuit contains an integrating link with the transfer function Wfb(r) = Kz/r ; the transfer function 
TI - Transducers for pressure change rate
JO - Measurement Techniques
DO - 10.1007/BF00818670
DA - 2004-11-29
UR - https://www.deepdyve.com/lp/springer-journals/transducers-for-pressure-change-rate-0ONfusufSo
SP - 397
EP - 402
VL - 18
IS - 3
DP - DeepDyve
ER -